Die and die-support.



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W. D. COOLIDGE. DIE AND DIE SUPPORT.

AAAAAAAAAA N FILED .TAN.17, 1907.

935,463, Patented Sept. 28, 1909.

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Specification of Letters latent.

Application nled January 17, lh?.

Patented Septu 28, Serial No. Sanfte.

To all 'whom 'it may concern:

Be it known that I, WILLIAM. D. Coonmea', a citizen of the United States, residing at Schenectady, county of Schenectady, State vof New York, have invented certain new yand useful Improvements in Dies and Die- Su'pports, of which the following is a specification.

This invention rglates'to an improved apparatus for the vextrusion or squirting of metal or other material to form wire. The apparatus includes a die and means for supporting the die in such a way that metal may be passed therethrough at a pressure as high as 150,000 pounds to the square inch.

Referring to the drawing forming a part of this specification, Figure 1 is a sectional elevation of the apparatus; Fig. 2 is an enlarged detail of the diamond die and the disk: on which it is mounted; and Fig. 3 is a detail of a modified form of die.

The pressing mechanism com rises acylindrical block 1 of hard tool steel aving a central cavity 2, containing the material to be extruded. Within this cavity is a steel pist0n or plunger 8 having a plunger head which may be forced downward by means of suitable pressing mechanism 4. The lower end of the cylindrical block. 1 is fitted with a cylindrical cap 5- having a central cone shaped opening 6 throu h the center thereof. This cap also has suitable cavities for holding other elements of the apparatus. The cap 5 is made of unhardened tool steel and may be secured to the cylinder 1, as shown in theldrawing.

The diamond die through which the eX- truded metal passes may be of the type commonly used in' wire drawing, but l prefer to use a die of a diderent shape for reasons hereinafter set forth. A. die suitable for wire drawing is shown in Fig.. 3 and consists of a cylindrical jewel having a conical cavity 8 `at the top vcornmnnicating with a small, straight, cylindrical orifice 9, which extends downward to near the 'lowersurface of the die, and opens into an abrupt enlargement. When such a die is used for Wire drawing the metal under treatment is passed in through the conical end of the cavity and is neckeddown by the haring walls of this opening. AIt might be assumed that such a die is well adapted for the extrusion of' metal and that the conical end of the vhole would serve to start the metal through the orifice. l dnd, however, that though the die will operate in the-pressing mechanism shown in Fig. 1, nevertheless the output of extruded metal can be greatlyA .bore in alinement with the Haring cavity 10 of the metal parts below.

l have found that when a diamond die is worked at a pressure of many thousand pounds per square inch, it is subject to such f bending strains that it is liable to crack and become useless unless special provisions are made for its support. 'It should be supported throughout the entire cross-sectional area in such a Way that the foundation on which it rests will not become deformed during operation. l find that the arrangement hereinafter described -is satisfactbry.

v'lhe under surface of the diamond die is `first ground to a plane surface. The dia- Inond is then set into a steel disk 11 with its top substantially ush with the top of the disk. I find it desirable to take care in cutting out the cavit in which the diamond is to be placed, and make the bottom of the cavity as near a plane surface as possible. The cavit is slightly larger in diameter than the iamond and the annular space is' filled with silver solder to secure the dian mond in the disk. The tight t between the diamond and the bottom of the cavityv prevents the silver solder from entering between these surfaces; the diamond there fore bears directly on the steel. l reinforce the steel disk 11 with an extremely hard steel disk 12.` AThe conical hole through the center of the hardened steel disk is direct-ly in line with a similar hole through the other dish so that the stock immediately below the diamond is rigidly supported against shearu ing stress and' is maintained in lits original position with respect to the die.;

l When the elements are assembledas shown in Fi 1, there is, of course, a tendency for the c arge '2 to ooze out between block 1 Btl and disk 1l. To prevent this I provide for an intimate contact between the upper surface of the disk and the bottom of the block ,immediately adjacent to the material under pressure. An annular groove or channel is made in the lower surface of the block l to diminish the area of the material in con- 'tact with disk 11. Arelatively narrow an- .equivalent materials 'of a hard and resisting character and suitable for use inthe relations set forth.

What I claim as new and desire to secure by -Letters Patent of the United States, is

1. In an extruding device, the combina-v tion of a jewel die, a steel block supporting said die, and a harder block below said first mentioned block and extending well under the edges of said die to reinforce the intervening metal.

2. In an extruding device, ajewel die having a dat end surface, a steel support in direct and intimate contact with said surface, and a steel block reinforcing said support immediately below said jewel.

3. The combination of a block having a .chamber in which metal may be compressed, 'a flange surrounding oneend of said chamber, a steel disk held in intimate contact with said flange, and a diamond die supported by said disk.

4. The combination of a block having a chamber in which metal may be compressed, a brittle die held -in alinement with said chamber, a disk supportingl said die, a fiange on said block in intimate contact with said disk, and a hardened steel block reinforcing said disk immediately beneath said die.

5. The combination of a metal block provided with a chamber in which material may be compressed, acap threaded to said block,

a hardened steel block carried by said cap, a

second steel block rreinforced by said harv dened block, a diamond die embedded in said second block, and a flange for preventing the Y escape of compressed metal over the surface,

of the die supporting block.

In witness whereof, I have hereunto set my hand' this 15th day of January, 1907.

' WILLIAM D. COOLIDGE. Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

